Windows 10: How can I make Windows use UEFI instead of BIOS without losing any data?

Discus and support How can I make Windows use UEFI instead of BIOS without losing any data? in Windows 10 Installation and Upgrade to solve the problem; Hi, How can I make Windows use UEFI instead of BIOS without losing any data? My disk is apparently using MBR right now, which only supports BIOS... Discussion in 'Windows 10 Installation and Upgrade' started by Warma99, Dec 24, 2019.

  1. Warma99 Win User

    How can I make Windows use UEFI instead of BIOS without losing any data?


    Hi,


    How can I make Windows use UEFI instead of BIOS without losing any data?


    My disk is apparently using MBR right now, which only supports BIOS mode.


    Currently running 1903, can I easily make this change during the update to 1909?


    I've seen some videos but they look kind of concerning, is there an easy way of doing this without losing any data?


    Thanks.

    :)
     
    Warma99, Dec 24, 2019
    #1
  2. Brink Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  


    Here it is:

     
    Brink, Dec 24, 2019
    #2
  3. tfwul Win User
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  


    Matter solved, thanks!

    FWIW ...

    [Screenshot 1]
    From admin command prompt

    mbr2gpt /validate /allowFullOS

    and then:

    mbr2gpt /convert /allowfullOS



    How can I make Windows use UEFI instead of BIOS without losing any data? [​IMG]


    =
    [Screenshot 2]
    From admin command prompt

    Diskpart
    List Disk


    shows the converted drive (disk 1)


    How can I make Windows use UEFI instead of BIOS without losing any data? [​IMG]


    =
    [Screenshot 3]
    Run msinfo32
    shows that now UEFI is enabled to boot from.


    How can I make Windows use UEFI instead of BIOS without losing any data? [​IMG]


    =
    [Screenshot 4]
    run dskmgmt
    before and after - shows an extra partition


    How can I make Windows use UEFI instead of BIOS without losing any data? [​IMG]


    =
    [Screenshot 5]
    Motherboard BIOS (Asus X99 DeLuxe/U3.1)
    select Boot section in BIOS
    select CSM
    select Enabled
    select UEFI and legacy OpROM

    'Enabled' and 'UEFI and legacy OpROM' were already selected in my case)
    (tried UEFI only, but that disables the keyboard)


    How can I make Windows use UEFI instead of BIOS without losing any data? [​IMG]

    =

    Small note:
    In my case the steps outlined in "How to Boot to UEFI Firmware Settings from inside Windows 10" didn't work.
    Start->Settings->Update & Security->Recovery->Restart Now (Advanced Startup)->Troubleshoot->Advanced Options...

    from this point on Windows restarted ("Please Wait" and "Turning off your computer"), instead of 'Startup settings",
    instead of getting "UEFI Firmware Settings".

    Anyway, matter solved.
     
    tfwul, Dec 24, 2019
    #3
  4. cereberus Win User

    How can I make Windows use UEFI instead of BIOS without losing any data?

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  


    For clarity, you can only change UEFI settings if already booted to UEFI. If booted as legacy bios, that option does not exist.
     
    cereberus, Dec 24, 2019
    #4
Thema:

How can I make Windows use UEFI instead of BIOS without losing any data?

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